SENIOR NOTES PAYABLE AND OTHER DEBT - Mortgages (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) senior_housing property loan	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Weighted average maturity period of mortgage loans	4 years 1 month 6 days
Unamortized fair value adjustment	$ 6,422	$ 11,587
Senior notes payable and other debt	$ 13,011,016	$ 13,522,551
Mortgage Loans and Other
Debt Instrument [Line Items]
Number of mortgage loans | loan	106,000
Principal amount of debt	$ 2,600,000
Number of properties securing debt | property	102,000
Number of mortgage loans with fixed interest rate | senior_housing	95,000
Mortgage loans with fixed interest rate	$ 2,200,000
Number of mortgage loans with variable interest rate | senior_housing	11,000
Mortgage loans with variable interest rate	$ 438,900
Repayments of debt	$ 596,900
Mortgage Loans and Other | Fixed Rate Debt
Debt Instrument [Line Items]
Weighted interest rate	4.40%
Mortgage Loans and Other | Variable Rate Debt
Debt Instrument [Line Items]
Weighted interest rate	4.90%
Mortgage Loans and Other | Minimum
Debt Instrument [Line Items]
Long-term debt, percentage bearing fixed interest	2.24%
Long-term debt, percentage bearing variable interest	2.45%
Mortgage Loans and Other | Maximum
Debt Instrument [Line Items]
Long-term debt, percentage bearing fixed interest	7.13%
Long-term debt, percentage bearing variable interest	7.12%